1 /* Definitions of target machine for GNU compiler,
2 for 64 bit PowerPC linux.
3 Copyright (C) 2000-2023 Free Software Foundation, Inc.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published
9 by the Free Software Foundation; either version 3, or (at your
10 option) any later version.
11
12 GCC is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
15 License for more details.
16
17 Under Section 7 of GPL version 3, you are granted additional
18 permissions described in the GCC Runtime Library Exception, version
19 3.1, as published by the Free Software Foundation.
20
21 You should have received a copy of the GNU General Public License and
22 a copy of the GCC Runtime Library Exception along with this program;
23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 <http://www.gnu.org/licenses/>. */
25
26 #ifndef RS6000_BI_ARCH
27
28 #undef TARGET_64BIT
29 #define TARGET_64BIT 1
30
31 #define DEFAULT_ARCH64_P 1
32 #define RS6000_BI_ARCH_P 0
33
34 #else
35
36 #define DEFAULT_ARCH64_P (TARGET_DEFAULT & MASK_64BIT)
37 #define RS6000_BI_ARCH_P 1
38
39 #endif
40
41 #ifdef IN_LIBGCC2
42 #undef TARGET_64BIT
43 #ifdef __powerpc64__
44 #define TARGET_64BIT 1
45 #else
46 #define TARGET_64BIT 0
47 #endif
48 #endif
49
50 #undef TARGET_AIX
51 #define TARGET_AIX TARGET_64BIT
52
53 #ifdef HAVE_LD_NO_DOT_SYMS
54 /* New ABI uses a local sym for the function entry point. */
55 extern int dot_symbols;
56 #undef DOT_SYMBOLS
57 #define DOT_SYMBOLS dot_symbols
58 #endif
59
60 #define TARGET_PROFILE_KERNEL profile_kernel
61
62 #undef TARGET_KEEP_LEAF_WHEN_PROFILED
63 #define TARGET_KEEP_LEAF_WHEN_PROFILED rs6000_keep_leaf_when_profiled
64
65 #define TARGET_USES_LINUX64_OPT 1
66 #ifdef HAVE_LD_LARGE_TOC
67 #undef TARGET_CMODEL
68 #define TARGET_CMODEL rs6000_current_cmodel
69 #define SET_CMODEL(opt) rs6000_current_cmodel = opt
70 #else
71 #define SET_CMODEL(opt) do {} while (0)
72 #endif
73
74 #undef PROCESSOR_DEFAULT
75 #define PROCESSOR_DEFAULT PROCESSOR_POWER7
76 #undef PROCESSOR_DEFAULT64
77 #define PROCESSOR_DEFAULT64 PROCESSOR_POWER8
78
79 /* We don't need to generate entries in .fixup, except when
80 -mrelocatable or -mrelocatable-lib is given. */
81 #undef RELOCATABLE_NEEDS_FIXUP
82 #define RELOCATABLE_NEEDS_FIXUP \
83 (rs6000_isa_flags & rs6000_isa_flags_explicit & OPTION_MASK_RELOCATABLE)
84
85 #undef RS6000_ABI_NAME
86 #define RS6000_ABI_NAME "linux"
87
88 #define INVALID_64BIT "%<-m%s%> not supported in this configuration"
89 #define INVALID_32BIT INVALID_64BIT
90
91 #ifdef LINUX64_DEFAULT_ABI_ELFv2
92 #define ELFv2_ABI_CHECK (rs6000_elf_abi != 1)
93 #else
94 #define ELFv2_ABI_CHECK (rs6000_elf_abi == 2)
95 #endif
96
97 #undef SUBSUBTARGET_OVERRIDE_OPTIONS
98 #define SUBSUBTARGET_OVERRIDE_OPTIONS \
99 do rs6000_linux64_override_options (); while (0)
100
101 #undef ASM_SPEC
102 #undef LINK_OS_LINUX_SPEC
103 #undef LINK_SECURE_PLT_SPEC
104
105 #ifndef RS6000_BI_ARCH
106 #define ASM_SPEC "%(asm_spec64) %(asm_spec_common)"
107 #define LINK_OS_LINUX_SPEC "%(link_os_linux_spec64)"
108 #define LINK_SECURE_PLT_SPEC ""
109 #else
110 #if DEFAULT_ARCH64_P
111 #define ASM_SPEC "%{m32:%(asm_spec32)}%{!m32:%(asm_spec64)} %(asm_spec_common)"
112 #define LINK_OS_LINUX_SPEC "%{m32:%(link_os_linux_spec32)}%{!m32:%(link_os_linux_spec64)}"
113 #define LINK_SECURE_PLT_SPEC "%{m32: " LINK_SECURE_PLT_DEFAULT_SPEC "}"
114 #else
115 #define ASM_SPEC "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
116 #define LINK_OS_LINUX_SPEC "%{!m64:%(link_os_linux_spec32)}%{m64:%(link_os_linux_spec64)}"
117 #define LINK_SECURE_PLT_SPEC "%{!m64: " LINK_SECURE_PLT_DEFAULT_SPEC "}"
118 #endif
119 #endif
120
121 #define ASM_SPEC32 "-a32 \
122 %{mrelocatable} %{mrelocatable-lib} %{" FPIE_OR_FPIC_SPEC ":-K PIC} \
123 %{memb|msdata=eabi: -memb}"
124
125 #define ASM_SPEC64 "-a64"
126
127 #define ASM_SPEC_COMMON "%(asm_cpu) \
128 %{,assembler|,assembler-with-cpp: %{mregnames} %{mno-regnames}}" \
129 ENDIAN_SELECT(" -mbig", " -mlittle", DEFAULT_ASM_ENDIAN)
130
131 #undef SUBSUBTARGET_EXTRA_SPECS
132 #define SUBSUBTARGET_EXTRA_SPECS \
133 { "asm_spec_common", ASM_SPEC_COMMON }, \
134 { "asm_spec32", ASM_SPEC32 }, \
135 { "asm_spec64", ASM_SPEC64 }, \
136 { "link_os_linux_spec32", LINK_OS_LINUX_SPEC32 }, \
137 { "link_os_linux_spec64", LINK_OS_LINUX_SPEC64 }, \
138 { "link_os_extra_spec32", LINK_OS_EXTRA_SPEC32 }, \
139 { "link_os_extra_spec64", LINK_OS_EXTRA_SPEC64 }, \
140 { "link_os_new_dtags", LINK_OS_NEW_DTAGS_SPEC }, \
141 { "include_extra", INCLUDE_EXTRA_SPEC }, \
142 { "dynamic_linker_prefix", DYNAMIC_LINKER_PREFIX },
143
144 /* Optional specs used for overriding the system include directory, default
145 -rpath links, and prefix for the dynamic linker. Normally, there are not
146 defined, but if the user configure with the --with-advance-toolchain=<xxx>
147 option, the advance-toolchain.h file will override these. */
148 #ifndef INCLUDE_EXTRA_SPEC
149 #define INCLUDE_EXTRA_SPEC ""
150 #endif
151
152 #ifndef LINK_OS_EXTRA_SPEC32
153 #define LINK_OS_EXTRA_SPEC32 ""
154 #endif
155
156 #ifndef LINK_OS_EXTRA_SPEC64
157 #define LINK_OS_EXTRA_SPEC64 ""
158 #endif
159
160 #ifndef LINK_OS_NEW_DTAGS_SPEC
161 #define LINK_OS_NEW_DTAGS_SPEC ""
162 #endif
163
164 #ifndef DYNAMIC_LINKER_PREFIX
165 #define DYNAMIC_LINKER_PREFIX ""
166 #endif
167
168 #undef MULTILIB_DEFAULTS
169 #if DEFAULT_ARCH64_P
170 #define MULTILIB_DEFAULTS { "m64" }
171 #else
172 #define MULTILIB_DEFAULTS { "m32" }
173 #endif
174
175 /* Split stack is only supported for 64 bit, and requires glibc >= 2.18. */
176 #if TARGET_GLIBC_MAJOR * 1000 + TARGET_GLIBC_MINOR >= 2018
177 # ifndef RS6000_BI_ARCH
178 # define TARGET_CAN_SPLIT_STACK
179 # else
180 # if DEFAULT_ARCH64_P
181 /* Supported, and the default is -m64 */
182 # define TARGET_CAN_SPLIT_STACK_64BIT 1
183 # else
184 /* Supported, and the default is -m32 */
185 # define TARGET_CAN_SPLIT_STACK_64BIT 0
186 # endif
187 # endif
188 #endif
189
190 #ifndef RS6000_BI_ARCH
191
192 /* 64-bit PowerPC Linux always has a TOC. */
193 #undef TARGET_HAS_TOC
194 #define TARGET_HAS_TOC 1
195
196 /* Some things from sysv4.h we don't do when 64 bit. */
197 #undef OPTION_RELOCATABLE
198 #define OPTION_RELOCATABLE 0
199 #undef OPTION_EABI
200 #define OPTION_EABI 0
201 #undef OPTION_PROTOTYPE
202 #define OPTION_PROTOTYPE 0
203 #undef RELOCATABLE_NEEDS_FIXUP
204 #define RELOCATABLE_NEEDS_FIXUP 0
205
206 #endif
207
208 /* We use glibc _mcount for profiling. */
209 #define NO_PROFILE_COUNTERS 1
210 #define PROFILE_HOOK(LABEL) \
211 do { if (TARGET_64BIT) output_profile_hook (LABEL); } while (0)
212
213 /* PowerPC64 Linux word-aligns FP doubles when -malign-power is given. */
214 #undef ADJUST_FIELD_ALIGN
215 #define ADJUST_FIELD_ALIGN(FIELD, TYPE, COMPUTED) \
216 ((TARGET_64BIT \
217 && TARGET_ALIGN_NATURAL == 0 \
218 && TYPE_MODE (strip_array_types (TYPE)) == DFmode) \
219 ? MIN ((COMPUTED), 32) \
220 : (COMPUTED))
221
222 /* PowerPC64 Linux increases natural record alignment to doubleword if
223 the first field is an FP double, only if in power alignment mode. */
224 #undef ROUND_TYPE_ALIGN
225 #define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \
226 ((TARGET_64BIT \
227 && (TREE_CODE (STRUCT) == RECORD_TYPE \
228 || TREE_CODE (STRUCT) == UNION_TYPE \
229 || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \
230 && TARGET_ALIGN_NATURAL == 0) \
231 ? rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \
232 : MAX ((COMPUTED), (SPECIFIED)))
233
234 /* Use the default for compiling target libs. */
235 #ifdef IN_TARGET_LIBS
236 #undef TARGET_ALIGN_NATURAL
237 #define TARGET_ALIGN_NATURAL 1
238 #endif
239
240 /* Indicate that jump tables go in the text section. */
241 #undef JUMP_TABLES_IN_TEXT_SECTION
242 #define JUMP_TABLES_IN_TEXT_SECTION TARGET_64BIT
243
244 /* The linux ppc64 ABI isn't explicit on whether aggregates smaller
245 than a doubleword should be padded upward or downward. You could
246 reasonably assume that they follow the normal rules for structure
247 layout treating the parameter area as any other block of memory,
248 then map the reg param area to registers. i.e. pad upward.
249 Setting both of the following defines results in this behavior.
250 Setting just the first one will result in aggregates that fit in a
251 doubleword being padded downward, and others being padded upward.
252 Not a bad idea as this results in struct { int x; } being passed
253 the same way as an int. */
254 #define AGGREGATE_PADDING_FIXED TARGET_64BIT
255 #define AGGREGATES_PAD_UPWARD_ALWAYS 0
256
257 /* Specify padding for the last element of a block move between
258 registers and memory. FIRST is nonzero if this is the only
259 element. */
260 #define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
261 (!(FIRST) ? PAD_UPWARD : targetm.calls.function_arg_padding (MODE, TYPE))
262
263 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
264 process. */
265 #define OS_MISSING_POWERPC64 !TARGET_64BIT
266
267 #ifdef SINGLE_LIBC
268 #define OPTION_GLIBC_P(opts) (DEFAULT_LIBC == LIBC_GLIBC)
269 #define OPTION_UCLIBC_P(opts) (DEFAULT_LIBC == LIBC_UCLIBC)
270 #define OPTION_BIONIC_P(opts) (DEFAULT_LIBC == LIBC_BIONIC)
271 #undef OPTION_MUSL_P
272 #define OPTION_MUSL_P(opts) (DEFAULT_LIBC == LIBC_MUSL)
273 #else
274 #define OPTION_GLIBC_P(opts) ((opts)->x_linux_libc == LIBC_GLIBC)
275 #define OPTION_UCLIBC_P(opts) ((opts)->x_linux_libc == LIBC_UCLIBC)
276 #define OPTION_BIONIC_P(opts) ((opts)->x_linux_libc == LIBC_BIONIC)
277 #undef OPTION_MUSL_P
278 #define OPTION_MUSL_P(opts) ((opts)->x_linux_libc == LIBC_MUSL)
279 #endif
280 #define OPTION_GLIBC OPTION_GLIBC_P (&global_options)
281 #define OPTION_UCLIBC OPTION_UCLIBC_P (&global_options)
282 #define OPTION_BIONIC OPTION_BIONIC_P (&global_options)
283 #undef OPTION_MUSL
284 #define OPTION_MUSL OPTION_MUSL_P (&global_options)
285
286 /* Determine what functions are present at the runtime;
287 this includes full c99 runtime and sincos. */
288 #undef TARGET_LIBC_HAS_FUNCTION
289 #define TARGET_LIBC_HAS_FUNCTION linux_libc_has_function
290
291 #undef TARGET_OS_CPP_BUILTINS
292 #define TARGET_OS_CPP_BUILTINS() \
293 do \
294 { \
295 if (strcmp (rs6000_abi_name, "linux") == 0 \
296 || strcmp (rs6000_abi_name, "aixdesc") == 0) \
297 GNU_USER_TARGET_OS_CPP_BUILTINS(); \
298 if (TARGET_64BIT) \
299 { \
300 builtin_define ("__PPC__"); \
301 builtin_define ("__PPC64__"); \
302 builtin_define ("__powerpc__"); \
303 builtin_define ("__powerpc64__"); \
304 if (!DOT_SYMBOLS) \
305 builtin_define ("_CALL_LINUX"); \
306 builtin_assert ("cpu=powerpc64"); \
307 builtin_assert ("machine=powerpc64"); \
308 } \
309 else \
310 { \
311 builtin_define_std ("PPC"); \
312 builtin_define_std ("powerpc"); \
313 builtin_assert ("cpu=powerpc"); \
314 builtin_assert ("machine=powerpc"); \
315 TARGET_OS_SYSV_CPP_BUILTINS (); \
316 } \
317 } \
318 while (0)
319
320 #undef CPP_OS_DEFAULT_SPEC
321 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux) %(include_extra)"
322
323 #undef LINK_SHLIB_SPEC
324 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}} \
325 %{static-pie:-static -pie --no-dynamic-linker -z text}"
326
327 #undef LIB_DEFAULT_SPEC
328 #define LIB_DEFAULT_SPEC "%(lib_linux)"
329
330 #undef STARTFILE_DEFAULT_SPEC
331 #define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
332
333 #undef ENDFILE_DEFAULT_SPEC
334 #define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
335
336 #undef LINK_START_DEFAULT_SPEC
337 #define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
338
339 #undef LINK_OS_DEFAULT_SPEC
340 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
341
342 #define GLIBC_DYNAMIC_LINKER32 "%(dynamic_linker_prefix)/lib/ld.so.1"
343
344 #ifdef LINUX64_DEFAULT_ABI_ELFv2
345 #define GLIBC_DYNAMIC_LINKER64 \
346 "%{mabi=elfv1:%(dynamic_linker_prefix)/lib64/ld64.so.1;" \
347 ":%(dynamic_linker_prefix)/lib64/ld64.so.2}"
348 #else
349 #define GLIBC_DYNAMIC_LINKER64 \
350 "%{mabi=elfv2:%(dynamic_linker_prefix)/lib64/ld64.so.2;" \
351 ":%(dynamic_linker_prefix)/lib64/ld64.so.1}"
352 #endif
353
354 #undef MUSL_DYNAMIC_LINKER32
355 #define MUSL_DYNAMIC_LINKER32 \
356 "/lib/ld-musl-powerpc" MUSL_DYNAMIC_LINKER_E "%{msoft-float:-sf}.so.1"
357 #undef MUSL_DYNAMIC_LINKER64
358 #define MUSL_DYNAMIC_LINKER64 \
359 "/lib/ld-musl-powerpc64" MUSL_DYNAMIC_LINKER_E "%{msoft-float:-sf}.so.1"
360
361 #undef DEFAULT_ASM_ENDIAN
362 #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
363 #define DEFAULT_ASM_ENDIAN " -mlittle"
364 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux", \
365 " -m elf32lppclinux", \
366 " -m elf32lppclinux")
367 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc", \
368 " -m elf64lppc", \
369 " -m elf64lppc")
370 #else
371 #define DEFAULT_ASM_ENDIAN " -mbig"
372 #define LINK_OS_LINUX_EMUL32 ENDIAN_SELECT(" -m elf32ppclinux", \
373 " -m elf32lppclinux", \
374 " -m elf32ppclinux")
375 #define LINK_OS_LINUX_EMUL64 ENDIAN_SELECT(" -m elf64ppc", \
376 " -m elf64lppc", \
377 " -m elf64ppc")
378 #endif
379
380 #define LINK_OS_LINUX_SPEC32 LINK_OS_LINUX_EMUL32 " %{!shared: %{!static: \
381 %{!static-pie: \
382 %{rdynamic:-export-dynamic} \
383 -dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "}}} \
384 %(link_os_extra_spec32)"
385
386 #define LINK_OS_LINUX_SPEC64 LINK_OS_LINUX_EMUL64 " %{!shared: %{!static: \
387 %{!static-pie: \
388 %{rdynamic:-export-dynamic} \
389 -dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "}}} \
390 %(link_os_extra_spec64)"
391
392 /* Use gnu-user.h LINK_GCC_SEQUENCE_SPEC for linux. */
393 #undef LINK_GCC_C_SEQUENCE_SPEC
394 #define LINK_GCC_C_SEQUENCE_SPEC \
395 "%{mads|myellowknife|mmvme|msim:%G %L %G;" \
396 "!mcall-*|mcall-linux:" GNU_USER_TARGET_LINK_GCC_C_SEQUENCE_SPEC ";" \
397 ":%G %L %G}"
398
399 #undef TOC_SECTION_ASM_OP
400 #define TOC_SECTION_ASM_OP \
401 (TARGET_64BIT \
402 ? "\t.section\t\".toc\",\"aw\"" \
403 : "\t.section\t\".got\",\"aw\"")
404
405 #undef MINIMAL_TOC_SECTION_ASM_OP
406 #define MINIMAL_TOC_SECTION_ASM_OP \
407 (TARGET_64BIT \
408 ? "\t.section\t\".toc1\",\"aw\"" \
409 : (flag_pic \
410 ? "\t.section\t\".got2\",\"aw\"" \
411 : "\t.section\t\".got1\",\"aw\""))
412
413 /* Must be at least as big as our pointer type. */
414 #undef SIZE_TYPE
415 #define SIZE_TYPE (TARGET_64BIT ? "long unsigned int" : "unsigned int")
416
417 #undef PTRDIFF_TYPE
418 #define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
419
420 #undef WCHAR_TYPE
421 #define WCHAR_TYPE (TARGET_64BIT ? "int" : "long int")
422 #undef WCHAR_TYPE_SIZE
423 #define WCHAR_TYPE_SIZE 32
424
425 #undef RS6000_MCOUNT
426 #define RS6000_MCOUNT "_mcount"
427
428 #ifdef __powerpc64__
429 /* _init and _fini functions are built from bits spread across many
430 object files, each potentially with a different TOC pointer. For
431 that reason, place a nop after the call so that the linker can
432 restore the TOC pointer if a TOC adjusting call stub is needed. */
433 #if DOT_SYMBOLS
434 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
435 asm (SECTION_OP "\n" \
436 " bl ." #FUNC "\n" \
437 " nop\n" \
438 " .previous");
439 #else
440 #define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
441 asm (SECTION_OP "\n" \
442 " bl " #FUNC "\n" \
443 " nop\n" \
444 " .previous");
445 #endif
446 #endif
447
448 /* FP save and restore routines. */
449 #undef SAVE_FP_PREFIX
450 #define SAVE_FP_PREFIX (TARGET_64BIT ? "._savef" : "_savefpr_")
451 #undef SAVE_FP_SUFFIX
452 #define SAVE_FP_SUFFIX ""
453 #undef RESTORE_FP_PREFIX
454 #define RESTORE_FP_PREFIX (TARGET_64BIT ? "._restf" : "_restfpr_")
455 #undef RESTORE_FP_SUFFIX
456 #define RESTORE_FP_SUFFIX ""
457
458 /* Dwarf2 debugging. */
459 #undef PREFERRED_DEBUGGING_TYPE
460 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
461
462 /* This is how to declare the size of a function. */
463 #undef ASM_DECLARE_FUNCTION_SIZE
464 #define ASM_DECLARE_FUNCTION_SIZE(FILE, FNAME, DECL) \
465 do \
466 { \
467 if (!flag_inhibit_size_directive) \
468 { \
469 fputs ("\t.size\t", (FILE)); \
470 if (TARGET_64BIT && DOT_SYMBOLS) \
471 putc ('.', (FILE)); \
472 assemble_name ((FILE), (FNAME)); \
473 fputs (",.-", (FILE)); \
474 rs6000_output_function_entry (FILE, FNAME); \
475 putc ('\n', (FILE)); \
476 } \
477 } \
478 while (0)
479
480 /* Return nonzero if this entry is to be written into the constant
481 pool in a special way. We do so if this is a SYMBOL_REF, LABEL_REF
482 or a CONST containing one of them. If -mfp-in-toc (the default),
483 we also do this for floating-point constants. We actually can only
484 do this if the FP formats of the target and host machines are the
485 same, but we can't check that since not every file that uses
486 the macros includes real.h. We also do this when we can write an
487 integer into the TOC and the entry is not larger than a TOC entry,
488 but not for -mcmodel=medium where we'll use a toc-relative load for
489 constants outside the TOC. */
490
491 #undef ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
492 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE) \
493 (TARGET_TOC \
494 && (SYMBOL_REF_P (X) \
495 || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS \
496 && SYMBOL_REF_P (XEXP (XEXP (X, 0), 0))) \
497 || GET_CODE (X) == LABEL_REF \
498 || (CONST_INT_P (X) \
499 && TARGET_CMODEL != CMODEL_MEDIUM \
500 && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode)) \
501 || (CONST_DOUBLE_P (X) \
502 && ((TARGET_64BIT \
503 && (TARGET_MINIMAL_TOC \
504 || (SCALAR_FLOAT_MODE_P (GET_MODE (X)) \
505 && ! TARGET_NO_FP_IN_TOC))) \
506 || (!TARGET_64BIT \
507 && !TARGET_NO_FP_IN_TOC \
508 && SCALAR_FLOAT_MODE_P (GET_MODE (X)) \
509 && BITS_PER_WORD == HOST_BITS_PER_INT)))))
510
511 /* Select a format to encode pointers in exception handling data. CODE
512 is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is
513 true if the symbol may be affected by dynamic relocations. */
514 #undef ASM_PREFERRED_EH_DATA_FORMAT
515 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
516 (TARGET_64BIT || flag_pic \
517 ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel \
518 | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4)) \
519 : DW_EH_PE_absptr)
520
521 /* For backward compatibility, we must continue to use the AIX
522 structure return convention. */
523 #undef DRAFT_V4_STRUCT_RET
524 #define DRAFT_V4_STRUCT_RET (!TARGET_64BIT)
525
526 #ifdef TARGET_LIBC_PROVIDES_SSP
527 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2),
528 ppc64 glibc provides it at -0x7010(13). */
529 #define TARGET_THREAD_SSP_OFFSET (TARGET_64BIT ? -0x7010 : -0x7008)
530 #endif
531
532 #define POWERPC_LINUX
533
534 /* ppc{32,64} linux has 128-bit long double support in glibc 2.4 and later. */
535 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
536 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
537 #endif
538
539 /* Static stack checking is supported by means of probes. */
540 #define STACK_CHECK_STATIC_BUILTIN 1
541
542 /* The default value isn't sufficient in 64-bit mode. */
543 #define STACK_CHECK_PROTECT (TARGET_64BIT ? 16 * 1024 : 12 * 1024)
544
545 /* Software floating point support for exceptions and rounding modes
546 depends on the C library in use. */
547 #undef TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P
548 #define TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P \
549 rs6000_linux_float_exceptions_rounding_supported_p
550
551 /* Support for TARGET_ATOMIC_ASSIGN_EXPAND_FENV without FPRs depends
552 on glibc 2.19 or greater. */
553 #if TARGET_GLIBC_MAJOR > 2 \
554 || (TARGET_GLIBC_MAJOR == 2 && TARGET_GLIBC_MINOR >= 19)
555 #define RS6000_GLIBC_ATOMIC_FENV 1
556 #endif
557
558 /* The IEEE 128-bit emulator is only built on Linux systems. Flag that we
559 should enable the type handling for KFmode on VSX systems even if we are not
560 enabling the __float128 keyword. */
561 #undef TARGET_FLOAT128_ENABLE_TYPE
562 #define TARGET_FLOAT128_ENABLE_TYPE 1
563
564 /* Enable using prefixed PC-relative addressing on POWER10 if the ABI
565 supports it. The ELF v2 ABI only supports PC-relative relocations for
566 the medium code model. */
567 #define PCREL_SUPPORTED_BY_OS (TARGET_POWER10 && TARGET_PREFIXED \
568 && ELFv2_ABI_CHECK \
569 && TARGET_CMODEL == CMODEL_MEDIUM)